State of the art Dynamo Waterproof flashlight is powered both by a hand crank and solar panel. This flashlight is waterproof up to 10 meters and has three LED lighting settings. The high efficiency dynamo system allows one minute of winding to create enough power for 1 LED to last an hour and a half or 3 LEDs to last for 30 minutes. Great tool for every home, automobile, RV, boat, office, and school. Never needs batteries.